Synthesis of LiFe(1-x)V (x) PO4/C composite cathode materials with high performance via an aqueous solution-evaporation method
Synthesis of LiFe(1-x)V (x) PO4/C composite cathode materials with high performance via an aqueous solution-evaporation method
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水溶液蒸发法合成高性能LiFe(1-x)V(x)PO4/C复合正极材料
DOI：
10.1007/s10008-013-2319-5
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发表时间：
2014
影响因子：
2.5
通讯作者：
Yang Zhenyu
中科院分区：
文献类型：
--
作者：
Gu Ningyu;Wang Hao;Li Yang;Ma Hongyu;He Xinghua;Yang Zhenyu
为了使LiFePO4正极材料在锂离子电池中实现高倍率性能，采用了在颗粒表面涂覆碳和在铁位掺杂钒的改性技术。为了设计和合成LiST(1−x)VxPO4/C(x= 0、0.0 2、0.0 5或0.0 8)复合材料，采用了水溶液-蒸发法，即每种原料的分布高度均匀。LiFe0.95V0.05PO4/2.57wt%C复合材料的电化学性能最好。在0.1C、0.5C、2℃、5℃和10C(1C = 170mAg−1)的条件下，其放电容量分别为157.8、156.9、149mA、139.6和130.1 mAHg−1。复合材料也表现出良好的循环稳定性，在不同倍率下100次循环后，首次放电容量分别保持了100%(0.5C)、99.7%(2C)、98.9%(5C)和96.6%(10C)。
The modification techniques of applying carbon coating on particle surface and doping vanadium at Fe site were applied to make the LiFePO4cathode materials achieve high rate performance in lithium ion batteries. To design and synthesize these LiFe(1−x)VxPO4/C (x= 0, 0.02, 0.05, or 0.08) composites, an aqueous solution–evaporation method was taken, in which every kind of raw material was distributed at a high degree of uniformity. The LiFe0.95V0.05PO4/2.57 wt% C composite displayed the best electrochemical performances. At rates of 0.1, 0.5, 2, 5, and 10 C (1 C = 170 mAg−1), it delivered a discharge capacity of 157.8, 156.9, 149, 139.6, and 130.1 mAh g−1, respectively. The composite exhibited perfect cycle stabilities as well, maintaining 100 % (0.5 C), 99.7 % (2 C), 98.9 % (5 C), and 96.6 % (10 C) of the first discharge capacity after 100 cycles at different rates, respectively.